Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fdb019901a90d2e…

MALICIOUS

PDF

76.3 KB Created: 2021-09-11 11:20:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 223125343b469de58bbfd41bb89e05a5 SHA-1: a3849b1aeeb733f154f8e6d7d7745c14277d5766 SHA-256: 4fdb019901a90d2ead42c971f4bc8375cf4e5da8e55d5d2a90fcba9856c5fb02
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. The document contains numerous embedded URLs, many of which point to suspicious domains and are likely used to redirect users to phishing sites or download further malware. No scripts were extracted, but the overall structure and URL distribution suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://pappteam.hu/userfiles/file/25940205257.pdf In PDF document text
    • https://csodamalom.hu/files/files/47753877789.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/wakogopafukunu.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/loxozeberokobekowenigu.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/77480251501.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/2334681939.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/balivupazumokuv.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/26334692597.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/tonajusod.pdfIn PDF document text
    • http://skazka76.ru/pic/userfile/pipafikigove.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/44258302494.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/pojejefavaxa.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/kumukijakuwovarexufibatoj.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/63745791875.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/29528050445.pdfIn PDF document text
    • http://pentas.eu/userfiles/file/27040582416.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/kosuz.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/71591964775.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/totarana.pdfIn PDF document text
    • http://ityab.com/cache/fck_files/file/28228042037.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=beach+live+wallpaperPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A4 18056 bytes
SHA-256: 590ea3e2cbf0bf106d69d00fc315ac2127236afba1768ba3d6326bbffad4a0f4
font_01_sfnt_off0000f519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF519 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D30 10184 bytes
SHA-256: a49033e321b9e273dac8573f7ccab0c97db19e9acdf8f27e7c5b692b80fb9ebf

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